Cisco IOS and IOS XE Software VLAN Trunking Protocol Denial of Service Vulnerability

A vulnerability in the VLAN Trunking Protocol (VTP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to corrupt the internal VTP database on an affected device and cause a denial of service (DoS) condition. The vulnerability is due to a logic error in how the affected software handles a subset of VTP packets. An attacker could exploit this vulnerability by sending VTP packets in a sequence that triggers a timeout in the VTP message processing code of the affected software. A successful exploit could allow the attacker to impact the ability to create, modify, or delete VLANs and cause a DoS condition. There are workarounds that address this vulnerability. This vulnerability affects Cisco devices that are running a vulnerable release of Cisco IOS Software or Cisco IOS XE Software, are operating in VTP client mode or VTP server mode, and do not have a VTP domain name configured. The default configuration for Cisco devices that are running Cisco IOS Software or Cisco IOS XE Software and support VTP is to operate in VTP server mode with no domain name configured.

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输入验证不恰当

Cisco IOS Software和IOS XE Software VLAN Trunking Protocol子系统输入验证漏洞

Cisco IOS Software和IOS XE Software都是美国思科（Cisco）公司为其网络设备开发的操作系统。VLAN Trunking Protocol（VTP）是其中的一个中继协议子系统。 Cisco IOS Software和IOS XE Software中的VTP子系统存在输入验证漏洞，该漏洞源于受影响软件处理VTP数据包子集的方式存在逻辑错误。攻击者可通过发送VTP数据包利用该漏洞损坏内部VTP数据库，造成拒绝服务。

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